air duct

Isaac Kremer/ January 14, 2018/ / 0 comments

A pipe or boxlike construction, generally of sheet metal or wood, to convey fresh air to a room, air to the air chamber of a furnace, hot air from a furnace, or the like. This term is more often used for the temporary or slight construction, as distinguished from air drain, which is of masonry; but the distinction cannot be maintained in all cases. (Sturgis, 1900)